doctor

Dutch translation: rakel, rakelblad

12:46 Mar 2, 2021

English to Dutch translations [PRO]
Tech/Engineering - Paper / Paper Manufacturing

English term or phrase: doctor

"doctor" in this context. I don't know a valid translation for it in Dutch in this context. For instance: "Changing of doctor blades, knives, blades and other cutting equipment"; or also: "Deposits of application fluid or stock and paper residues on rolls, doctors, etc., or rolls wrapped with broke must never be cleaned by hand while the machine is running!". In this context, "doctor machines" are also mentioned; but have no idea how to translate that. Thank you in advance for the suggestions.

JAN SNAUWAERT KudoZ activity Questions: 87 (5 open) (9 without valid answers) (3 closed without grading) Answers: 328 Belgium
Local time: 18:10

Dutch translation:rakel, rakelblad

Explanation:
Bij een grote papiermachinefabrikant waarvoor ik manuals heb vertaald, gebruiken ze dit:

doctor blade - rakelblad
doctor - rakel

Het is volgens mij geen mes voor het afsnijden, maar voor het afstrijken (van een of ander residu) van de papierbaan.

IATE geeft ook:

doctor knife = afstrijkmes / afstrijkrakel
doctor blade/doctor bar = afstrijkmes

Selected response from:

Ron Willems
Netherlands
Local time: 18:10

Grading comment

Bedankt!
4 KudoZ points were awarded for this answer

Summary of answers provided

4 +3

rakel, rakelblad

Ron Willems

verdeel-, snij-

Max Nuijens

Summary of reference entries provided

Barend van Zadelhoff

Answers

10 mins confidence:

verdeel-, snij-

Explanation:
'doctor' kan de betekenis hebben van verdelen, doseren. Zo is een bijvoorbeeld 'doctor roll' een verdeel- of doseerwals.

In de contact van de papierindustrie wordt een 'doctor blade' of 'doctor knife' een verdeelmes of snijmes, een eenheid waarmee vellen papier op maat worden gesneden.

Max Nuijens
Netherlands
Local time: 18:10
Native speaker of:

Dutch
PRO pts in category: 4

54 mins confidence:

peer agreement (net): +3

rakel, rakelblad

Ron Willems
Netherlands
Local time: 18:10
Native speaker of:

Dutch
PRO pts in category: 16

Grading comment

Bedankt!

Reference comments

4 hrs

Reference

Reference information:
Q.1122: What is doctoring?
Ans.

Doctoring is an important element in paper machine functionality, sheet quality and productivity. Doctors are basically scraping equipment required in many positions on a paper machine and coater to remove contaminants or water from the rolls and for special functions like creping and coating.

Sheet Removal: The Doctoring system if located and installed properly then it helps in the removal of sheet from the surfaces of cylinders and rolls. The system also assists the machine operators in transporting the paper from Wet-End to Dry-End of the paper machine.

Roll Cleanliness: A correctly designed doctor blade ensures the cleanliness of the rolls and cylinders. If the design is not good enough then stickies/debris might build up on the rolls and transferred to paper resulting in poor quality of paper. If the Doctor is not set up properly i.e. if blade is not touching each and every part of the roll then the roll will not be clean. This is known as doctor missing.

Condition Rolls: For conditioning of the roll a correct doctoring system design is a must i.e. the right selection of holder, blade and other doctor components. Selection of blade material is very important. If a right choice is not made then it might result in damaging the roll e.g. if the roll cover material if soft rubber and a mill uses a metal blade, then the roll will be damaged. On a soft rubber one should use soft blade i.e. synthetic blade. If the selection were right then the blade would ensure roll condition automatically.

Water Removal: This is a part of roll cleanliness, but is mentioned separately because now a days it has become a major function of a doctor. At wet end of paper machine (Wire + press), the water removed from the sheet, stick to the roll. If this water is not scrapped, it will go back to the wire, felt and/or wet web.

Doctoring System:The doctor blade is held in a holder which in turn is mounted to a cross machine beam type structure called doctor back. The doctor back is mounted on journals that are supported by self aligning bearings and custom mounted brackets. Each doctor is loaded against the roll by an air cylinder system, adjustable torque arms or spring loaded rig. Further, an electromagnetic or pneumatic oscillation system provides improvement in performance of doctor. While selecting a unit or a system, the application requirements and the details of the duty should be well understood. The application variables include blade loading, roll temperature, sheet shedding, cleaning requirement, expected life and wear and overall system reliability.

Material: Doctor blades can be metallic, composite or of plastic material. The common metallic blades are bronze, steel and Monel. The bronze blades find use in burnishing of new dryers and the steel blades are mainly used for intermediate dryer doctor applications. The composite blades could be made of fibreglass, carbon fibre or a combination. Abrasive blades containing silicon carbide are used when dryer surface is dirty. Plastic blades do not carry fibre reinforcement and due to temperature limitation are not used on paper dryers. At high speeds, steel blades have spark risk and hence the composite blades find more acceptance

https://www.paperonweb.com/A1122.htm

Doctors are used on paper and board machines to remove excess water and contaminants from roll and cylinder surfaces, and to remove the sheet from these surfaces during sheet breaks and threading. Doctors must be properly installed and maintained to ensure their continued safe and efficient operation. It is important to examine worn blades and document wear patterns, and work with doctor and blade manufacturers to identify problems and improve doctoring operations. This course lists the potential causes and possible remedies for some well-known blade wear patterns. It also lists the steps necessary to properly install a doctor.

+ instructive video:

https://www.youtube.com/watch?v=kQDGmil2dXs

Barend van Zadelhoff
Netherlands
Native speaker of:

Dutch
PRO pts in category: 4

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Dutch translation: rakel, rakelblad

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